Harley Sportster muffler question

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  • BA80
    Doctor of XSology
    • Oct 2010
    • 9980
    • Tulsa, Ok

    #1

    Harley Sportster muffler question

    I have 2 of these and they will fit nicely on the head pipes I'm planning to install. They look very restrictive looking inside them though.

    Advice?


    Greg

    Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

    ― Albert Einstein

    80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

    The list changes.
  • dbeardslee
    XS-XJ Super Guru
    • Nov 2007
    • 4385
    • Maineville, OH

    #2
    I don't know, but I'll make an observation. Those mufflers appear to be setup for a crossover, in which case each cylinder would be using both mufflers at the same time. Maybe they need to be more restrictive when they're setup that way? JAT
    I think I have a loose screw behind the handlebars.

    '79 XS11 Standard, Jardine 4/1, Dyna DC1-1 Coils, 145 mains, 45 pilots, plastic floats - 25.7mm, XV920 fuel valves, inline fuel filters, speed bleeders, Mikes XS pods, spade-type fuse block, fork brace, progressive fork springs/shocks, manual petcocks, 750 FD, Venture cam chain tensioner, SS brake lines

    Comment

    • rover
      XSive Maximus
      • Jan 2004
      • 765
      • central WI (715)

      #3
      muffs

      I have two sets of them without the crossover. They are very loud, and meant to be installed on the same side. I never put them on an 1100. Heard one set on a XS650, very loud.
      put something smooooth betwen your legs, XS eleven
      79 F (Blueballs)
      79 SF (Redbutt)
      81 LH (organ donor)
      79 XS 650S (gone to MC heaven)
      76 CB 750 (gone to MC heaven)
      rover has spoken

      Comment

      • BA80
        Doctor of XSology
        • Oct 2010
        • 9980
        • Tulsa, Ok

        #4
        I thought of that too Doug but Rockin'D;s XS is in my garage and it has basically the same mufflers on it except for the opening for a crossover. Looking inside them they look the same.

        I tried to take a pic of the inside but it didn't turn out well. About half way through the baffle on the inlet side it's blocked off and there are several rows of tiny holes in the baffle pipe. The outlet looks the same but there appears to be less tiny holes in the baffle.
        Greg

        Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

        ― Albert Einstein

        80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

        The list changes.

        Comment

        • BA80
          Doctor of XSology
          • Oct 2010
          • 9980
          • Tulsa, Ok

          #5
          Originally posted by rover
          I have two sets of them without the crossover. They are very loud, and meant to be installed on the same side. I never put them on an 1100. Heard one set on a XS650, very loud.
          Heh heh heh, bet they aren't NEARLY as loud as what I have on there now.
          Greg

          Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

          ― Albert Einstein

          80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

          The list changes.

          Comment

          • motoman
            Master of XSology
            • Aug 2005
            • 8413
            • Grand Junction, Colorado

            #6
            Originally posted by BA80
            I have 2 of these and they will fit nicely on the head pipes I'm planning to install. They look very restrictive looking inside them though.

            Advice?


            Actually, several have used variations of those on their XSesssive. Your just gonna have to cut two circle plates, tack them around in several places, then weld all the way around.
            81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

            Comment

            • dbeardslee
              XS-XJ Super Guru
              • Nov 2007
              • 4385
              • Maineville, OH

              #7
              Originally posted by BA80
              I thought of that too Doug but Rockin'D;s XS is in my garage and it has basically the same mufflers on it except for the opening for a crossover. Looking inside them they look the same.

              I tried to take a pic of the inside but it didn't turn out well. About half way through the baffle on the inlet side it's blocked off and there are several rows of tiny holes in the baffle pipe. The outlet looks the same but there appears to be less tiny holes in the baffle.
              How's his bike run with them?

              One thing's for sure - if you hook 'em up with the crossover you should have less back pressure than without it. Probably get in the way of the center stand too, though. Okay, that's two things.
              I think I have a loose screw behind the handlebars.

              '79 XS11 Standard, Jardine 4/1, Dyna DC1-1 Coils, 145 mains, 45 pilots, plastic floats - 25.7mm, XV920 fuel valves, inline fuel filters, speed bleeders, Mikes XS pods, spade-type fuse block, fork brace, progressive fork springs/shocks, manual petcocks, 750 FD, Venture cam chain tensioner, SS brake lines

              Comment

              • BA80
                Doctor of XSology
                • Oct 2010
                • 9980
                • Tulsa, Ok

                #8
                Doc's bike ran good before it lost compression on one cylinder.

                The crossover can't be hooked up with the mufflers on opposite sides of the bike. The orientation of the bracket mounts and the crossover inlets won't allow it. They will have to be blocked.

                A freeze plug for an automotive engine should do nicely to plug them.
                Greg

                Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                ― Albert Einstein

                80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                The list changes.

                Comment

                • dbeardslee
                  XS-XJ Super Guru
                  • Nov 2007
                  • 4385
                  • Maineville, OH

                  #9
                  Originally posted by BA80
                  Doc's bike ran good before it lost compression on one cylinder.

                  The crossover can't be hooked up with the mufflers on opposite sides of the bike. The orientation of the bracket mounts and the crossover inlets won't allow it. They will have to be blocked.

                  A freeze plug for an automotive engine should do nicely to plug them.
                  If they work well on his you'd think they'd work fine on yours too. Freeze plug idea sounds like a good one. You gonna weld 'em in?
                  I think I have a loose screw behind the handlebars.

                  '79 XS11 Standard, Jardine 4/1, Dyna DC1-1 Coils, 145 mains, 45 pilots, plastic floats - 25.7mm, XV920 fuel valves, inline fuel filters, speed bleeders, Mikes XS pods, spade-type fuse block, fork brace, progressive fork springs/shocks, manual petcocks, 750 FD, Venture cam chain tensioner, SS brake lines

                  Comment

                  • BA80
                    Doctor of XSology
                    • Oct 2010
                    • 9980
                    • Tulsa, Ok

                    #10
                    Originally posted by dbeardslee
                    If they work well on his you'd think they'd work fine on yours too. Freeze plug idea sounds like a good one. You gonna weld 'em in?
                    Wasn't planning on welding. I'll just find some with a good snug fit, drive them in and spike the edges of the inlet.
                    Greg

                    Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                    ― Albert Einstein

                    80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                    The list changes.

                    Comment

                    • Bikes
                      Truly XSive
                      • Oct 2014
                      • 174
                      • Coastal Maine

                      #11
                      Those are stock mufflers, probly not too loud.......only concern might be rejetting.....try em and see....
                      Mark
                      1980 xs1100g 3H5.......
                      1992 Ducati 907ie
                      2001 Moto Guzzi Jackal

                      Comment

                      • BA80
                        Doctor of XSology
                        • Oct 2010
                        • 9980
                        • Tulsa, Ok

                        #12
                        Originally posted by Bikes
                        Those are stock mufflers, probly not too loud.......only concern might be rejetting.....try em and see....
                        Jetting up or down? I'm one size up now running basically open pipes.
                        Greg

                        Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                        ― Albert Einstein

                        80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                        The list changes.

                        Comment

                        • natemoen
                          Master of XSology
                          • May 2010
                          • 8640
                          • Fargo

                          #13
                          Don't some Harley pipes have catalytic converters built into them? These aren't some of those are they?
                          Nathan
                          KD9ARL

                          μολὼν λαβέ

                          1978 XS1100E
                          K&N Filter
                          #45 pilot Jet, #137.5 Main Jet
                          OEM Exhaust
                          ATK Fork Brace
                          LED Dash lights
                          Ammeter, Oil Pressure, Oil Temp, and Volt Meters

                          Green Monster Coils
                          SS Brake Lines
                          Vision 550 Auto Tensioner

                          In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

                          Theodore Roosevelt

                          Comment

                          • BA80
                            Doctor of XSology
                            • Oct 2010
                            • 9980
                            • Tulsa, Ok

                            #14
                            Originally posted by natemoen
                            Don't some Harley pipes have catalytic converters built into them? These aren't some of those are they?
                            Doesn't say anything about exhaust emissions on the stamp on the side, just noise.
                            Greg

                            Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.”

                            ― Albert Einstein

                            80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

                            The list changes.

                            Comment

                            • motoman
                              Master of XSology
                              • Aug 2005
                              • 8413
                              • Grand Junction, Colorado

                              #15
                              Originally posted by BA80
                              Doc's bike ran good before it lost compression on one cylinder.

                              The crossover can't be hooked up with the mufflers on opposite sides of the bike. The orientation of the bracket mounts and the crossover inlets won't allow it. They will have to be blocked.

                              A freeze plug for an automotive engine should do nicely to plug them.
                              Find the righr size and weld them in.
                              81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

                              Comment

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